The commonly used term structural ceramics refers to ceramics used in various industrial sectors for manufacturing mechanical equipment and reprocessing tools. At present, the commonly used precision ceramic structures are alumina ceramics, silicon carbide ceramics, zirconia ceramics and ammonia silicon ceramics. The following is a small introduction to you about what are the common ceramic structural parts? What are the main molding processes?
What are the common industrial ceramic structural parts?
Industrial structural ceramics have excellent properties of wear resistance, corrosion resistance, and high temperature resistance. Highly functional structural ceramic products can be produced according to the needs of different industry sectors and their properties. Structural ceramic products are countless, ceramic center bar, ceramic pin gauge plug gauge, ceramic rod and pin, ceramic tube sleeve, ceramic ring. Ceramic shafts, etc., as well as electronic and electrical ceramics, aviation ceramics, military ceramics, etc.
What are the main molding processes for ceramic structural parts?
1. Hot press casting.
It is also known as hot press injection molding method, which is to inject molten wax-containing slurry into a metal mold under pressure, cool and solidify in the mold and then demold.
This method of zirconia ceramic structure forms products with accurate size, high finish and tight structure, and has been widely used to manufacture industrial ceramic products. Currently, some daily-use porcelain products are being trialed with hot-press injection molding, and hot-press injection process production lines have appeared overseas. Hot press injection molding is preparing to become one of the new methods of daily porcelain molding development.
2. Waiting for static pressure molding.
For zirconia structural ceramics with special shape and large size, isostatic molding should be used. After hydrostatic molding, the blank has high density, good uniformity, small firing shrinkage, and is not easy to deformation, cracking, and delamination. This molding method can avoid the delamination that easily occurs in dry pressing, especially for thick zirconia products, which are prone to delamination in dry pressing and can be avoided in hydrostatic molding. Therefore, this molding method is a common method for producing zirconia products. However, the blanks after hydrostatic forming need to be processed, and some raw materials will be wasted. Meanwhile, due to the hardness of the blanks, processing is troublesome and slow, or else the blanks are prone to fracture and the production efficiency is low.
3. Dry pressing forming.
For small and medium-sized zirconia ceramic products with simple shapes and suitable for dry pressing, dry pressing is usually used. A common problem with dry pressing of zirconia ceramics is product delamination. This is because zirconia ultrafine powder granulation material particles are very fine, so the particles are light and poorly flowable, and easily delaminated during dry pressing molding. From the production practice, we know that product delamination is related to the finish and fit of the molding mold, molding pressure, pressurization method, pressurization speed and holding time, demolding method and demolding speed.